Spray gun for fire apparatus and the like



Sept. 2, 1952 B. D. BARTON SPRAY GUN FOR FIRE APPARATUS AND THE LIKE Filed Dec. 5, 1949 IN VEN TOR.

|||.|| |||||l IIII .Il I I Patented Sept. 2, i952v UNITED STATI-:s PA'rENT oFFlc's" l Benjamin D. Barton, BattleCreek, Mich., assgnor to American Marsh Pumps, Inc., Battle Creek, Mich., a corporation of Michigan Application December v, 1949, SerialNo. 131,117 7 claims. (c1. 29g- 150) a This invention relates to improvements in spray guns for fire apparatus and the like.

. The main objects of this `invention are: a First, to provide a spray gun well adapted for use in the fighting of res and which is also adapted for use for` spraying treesand the like and which. isghighly eflicient for delivering socalled fog or mist and otheratypes of sprays up to substantially a solid stream delivery. t i

vgecond, to providea structure having these advantages which is easily controlled by the operator. l v .f

Third, to provide a structure in which the parts are very. simple and easily assembled. and disassembled should occasion requirebut one which is not likely to become clogged even when used in the spraying of liquids in which there are substantial amounts ofk solids. v z Objects relating to `details and economies of the invention will appear from the description to follow. The invention is pointed out in the claims. Y f

-A preferred embodiment ofv thev invention is Villustrated.in `the accompanyingfldrawing, in

which:` Fig.' 1 is a fragmentary side elevational view of a spray gun embodying my invention partially in longitudinal section. 'I Y Y Fig. 2 is an enlarged fragmentary view partially in longitudinal section with the valve in open position.4V I Y Fig. 3 isa fragmentary view corresponding to Fig.. 2 with thevalve partially open.

Referring to .the drawing the tubular barrel I is providedivvithY a so-called pistol type grip .2 constituting a supply. conduit opening,- to the barrell and having a suitable hose connection designated generally by the numeral 3. The barrel is provided with a chambered head comprising a nozzle section 4 and a coupling section l5 threaded into the nozzle sectionand threaded `upon the barrel. The head has an elongated discharge port 6 terminating in its `inner end in the annularl valve seat'l.4 `The wall 8 ofthe chamber is conical and merges into the valve seat. A.

The eduction tube 9 is slidablysupported in the spider or like guard I0 which is secured in position between the spacer II and the coupling member 5. This provides a very simple assembly in which the parts can be readily manufactured and assembled..V The conical control valve `I2 is desirably formed directly upon the eduction tubewhich also has a` tapered nozzle I3 project'- ing forwardly from the valve. This nozzleis of 'Patent-.isz Y such length that it projects beyond the valve centrally into the port in spaced relation to the Vwalls thereof during a substantial part of the movement of the valve to and from its seat but may be. en-V tirely withdrawn therefrom as is shown in Fig. 2. The cooperating relation of the nozzle to the port isillustrated in Fig. 3.

The eduction tube is provided with an air inlet I4 at itsrear end and with an outwardly seating check valve I5` biased toward its seatv by the springs I 6. The Aeduction tube, which constitutes the valve stem, is controlled from the trigger-like lever I'I pivoted at I8 and engaging the sleeve I9 slidable upon the barrel, the rear end of the sleeve being provided with a head 20 engaging the thrust nut 2l on the eduction tube. The spring 22 surrounding the eduction tube engages the thrust collar 23 thereon as shown by dotted lines in Fig. 1 to urge the valve to its seat.

When the valve is partially open, for example as shown in Fig. 3, the flow of liquid -under pressure I through the outlet port and around the nozzle serves to set up a flow of air through the eduction tube and air mixing with the liquid results in a spray, the character of the spray depending on the degree of opening of the valve. When the valve is in fully open position the nozzle I3 is fully retracted from the port and in this position the pressure of the liquid serves'to seat the check valve and a long solid stream results as compared to a spray. A very wide variation in the character of the discharge can be secured merely by manipulation of the valve.

l While the structure illustrated is primarily designed for fire fighting equipment the invention may be readily adapted in apparatus for use in spraying trees and the like Where avvide range in the character of the spray is desired and that is .particularly desirable in the spraying of trees of substantial height.

I have illustrated and described my improvements in a highly practical embodiment thereof. I have not attempted to illustrate or describe other embodiments or, adaptations as it is believed that this disclosure will enable those skilled in the art to embody or; adapt my invention as may be desired.

Having thus described my invention, what I claim as new. and desire to secure by Letters 1.' In a structure of the `class described, the

lcombina-tioncf a barrelprovided with a liquid supply connection and with a chambered head provided .with an elongated dischargeport and with a rearwardly facing valve seat atthe inner ing a substantial par-t of the movement ofA the'- valve to and from the seat but being entirely Withdrawn therefrom when the valve is in fully opened position, said eduction tube having an air inlet opening exteriorly of the barrel, an outw-ardly seating spring biased check valve for said air inlet, the vacuum in the eduction tube result-V ing from the fi-ow of liquid around the nozzle when the valve is partially opened inducing air now through the eduction tube, the pressure of the liquid when the valve is fully opened acting to seat the air inlet check valve, spring means actingv to'seat said control valve, andmeans fo manually open-ing the control valve.

Y2.'In a structureof the class described, the combination of `a barrel provided with a liquid supply connection and with .a -chambered-head provided with an elongated discharge port and 4 tube to be discharged into and mixed with the liquid as it is discharged through the discharge port, the pressure of the liquid when the valve is fully opened acting to seat the air inlet check valve and prevent flow of liquid out of said air inlet.

. 4. Inv 'a Astructure .of thefcl'ass described, the combination of a barrel provided with a liquid supply connection and with a chambered head provided with an elonga-ted discharge port and with a rearwardly facing valve seat at the inner end of the port, an eduction tube reciprocatingly supported in sai-d barrel in axial alignment with said port an-d having a control valve coacting with said valve seat, Iand a tapered nozzle projecting beyond the valve and centrally into j said port in spa-ced lrelation to the walls thereof with a rearwardly facing valve seat at thel inner end of the port, an eduction tube reciprocatngly supported in said barrel in axial alignment with said port'and having a control valve 'coacting with said valve seat, and a tapered nozzle projecting beyond the valve and centrally into said port in spaced relation to the walls thereof dur' ing a substan-tial part of the movement'of the valve to and from the seat but being entirely withdrawn therefrom when the vaive .is fully opened position, said eduction tube havingen Jair inlet opening exterio-rly of the barrel, an out- Wardly seating spring biased check valve for said air inlet, the vacuum in the eduction tube result- Iing from the flow of liquid around the nozzle when the valve is parti-ally opened inducing air 110W through the eduction tube, the pressure of the liquid When the valve is 4fully openedacting to seat the air inlet check valve, spring means acting to seat ,said control valve, and means for manually opening the control valve.V

3. In a structure of the class described, the combination of a barrel provided with a liquid supply connection and with la chambered head provided with an elongated discharge port and with a rearwardly facing valve seat Iat the inner end of the port, .the end wall of the chamber being corneal an-d merging into the valve seat, an eduotion tube reciprocatingly supported in said 'barrel in axial alignment with said port and having a conical forwardly facing control valve c0- acting with said valve seat, and a tapered nozzle projectingr beyond the valve and centrally into said port in spa-ced relation to the walls .thereof during a substantial pant of the movement of the valve to and from the seat but being entirely withdrawn therefrom when the valve is in fully opened'position, said eduction ltube havingan air inlet disposed rearwardly of' the valves thereof and opening exteriorly'of the barrel lto the outside atmosphere, an outwardly seating check valve for said air inlet, Aa spring normally retaining sai-d check valve in an outwardly seated position, the vacuum in the eduction tube re- "sulting 'from the flow of liquid around the nozzle vwhen Ithe valve is partially opened acting lto open the check valve admitting air 'to the induction during :a substantial part of the movement of the valve to and from the seat lbut being entirely withdrawn therefrom when the valve is in fully opened position, said eduction tube having an air inlet disposed rearwardly of the valve thereof and opening exteriorly of the barrel to the outside atmosphere, va check valve for saidy air inlet, said check-valve being outwardly -seating'and constituting means to preventfiow of liquid under pressure from the eduction 'tube and'to permit flow 'of atmospheric air into the tube, the vacuum in the eduction tube resulting from the flow of liquid around the nozzle when the valve is partially opened inducing opening of said check valve and air ilow through the eduction tube to provide a mist-like spray, the pressure of the liquid when the valve is fully opened act# ing to seat theair inlet check valve andprevent flow of liquid out of said air inlet.

5. In a structure of the class described, the combination of a barrel provided with a' liquid supply connection and with a chambered` hea-d provided withr a discharge port and' witha Arearwardly facing valve seat, the end wall of the chamber being conical and merging into the valve seat, an eduction tube reciprocatingly supported in said barrel in axial alignment with said port and having a control valve co-acting with said valve seat, and a tapered nozzle projecting beyond the valve and centrally into said' port during a substantial part of the'movement of the valve to and from the seat but being entirely withdrawn therefrom when the valve is in fully :opened position, said eduction tube having an air inlet disposed rearwardly of the valve thereof and opening exteriorly of the barrel to the outside atmosphere, a check valve for said air inlet, said check valve being outwardly seating and constituting means to prevent flow of liquid under pressure from the eduction tube and to permit flow of atmospheric air into the tube, the vacuum in vthe eduction tube 'resul-ting fromI the flow of liquid around the nozzle when the valve is partially opened inducing opening of said check valve and airflow through the eduction tube t-o provide a mist-like'spray, the pressure of the liquid when the valve is fully openedacting to seat the air inlet check valve and prevent flow ofiiquid outof said airiniet.

6. In a structure of the class described' Athe combination of a barrel provided with a liquid supply connection and with a vchambered head providedvwith a discharge port'and valve seat at the inner end of the port',v an eduction tube reciprocatingly 'supported in said-f barrel in axial aiignment'with said port 'and 'having a ebniai forwardly-facing control valve c'oacting with said valve seat.v and a tapered nozzle projecting bei yond the valve and centrally into said port during a substantial part of the movement of the valve to and from the seat but being entirely Withdrawn therefrom when the valve is in fully opened position, said eduction tube having an air inlet disposed'rearwardly of the valve thereof and opening exteriorly of the barrel to the outside atmosphere, a check valve for said air inlet, said check valve being outwardly seating and constituting means to prevent flow of liquid under pressure from the eduction tube and to permit ow of atmospheric air into the tube, the vacuum in the eduction tube resulting from the ow of liquid around the nozzle when the valve is partially opened inducing opening of said check valve and air now through the eduction tube to provide a mist-like spray the pressure of the liquid when the valve is fully opened acting to seat the air inlet check valve and prevent flow of liquid out of said air inlet.

7. In a structure oi the class described, the

combination of a barrel provided With a liquid supply connection for delivery of liquid to the barrel under pressure, and with a chambered head provided with an elongated discharge port and with a rearwardly facing valve seat at the inner end of the port, the end wall of the chamber being conical and merging into the valve seat, an eduction tube reciprocatingly supported in said barrel in axial alinement with said port and having a conical forwardly facing control valve coacting with said valve seat, said eduction tube being annularly spaced from said barrel to provide an annular passageway for the liquid through the barrel throughout substantially the entire length of the barrel, and a nozzle projecting beyond the valve centrally into such port in'spaced relation from the walls thereof during a substantial part of the movement of the valve to and from the seat, said eduction tube having an inlet disposed rearwardly of the valve thereof and opening exteriorly of the barrel to the outside atmosphere, the vacuum in the education tube resulting from the flow of the liquid under pressure around the nozzle when the valve is partially open inducing air flow from the outside atmosphere through said eduction tube to provide a mist-like spray, and means connected to said eduction tube for adjusting the same and valve.

BENJAlVIIN D. BARTON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Numberr Name Date 772,496 Brening Oct. 18, 1904 1,332,544 Davis Mar. 2, 1920 2,149,181 Krautzberger Feb. 28, 1939 2,259,215 Scheurer Oct. 14, 1941 2,497,625 Norwick Feb. 14, 1950 

